Polymer Sciences Open Access

Curious associative/dynamic properties of perfluorocarbon modified vinyl polymers in solutions, blends and in the solid state

4^th Edition of International Conference on Polymer Science and Technology

June 04-05, 2018 London, UK

Thieo Hogen Esch

University of Southern California, USA

Posters & Accepted Abstracts: Polym Sci

Abstract:

Perfluorocarbon (RF) groups attached as pendent groups to aqueous polymers (polyacrylamide and similar polymers) via spacer groups of various lengths have shown extraordinary hydrophobicity compared with hydrocarbon groups of similar lengths as shown by NMR, and rheology studies. Large RF mediated increases in polymer association especially for longer spacer groups were observed for a wide range of these polymers. In addition, blends of well-defined C4F9, C7F15, C10F21 and C13F27 end-functionalized polystyrene (RF-PS) and poly(n-butylmethacrylate) prepared by ATRP using RF–tagged initiators. Blends of these polymers have been studied by DSC, AFM, TEM and optical transmittance. The AFM micrographs show crater, necklace and other RF mediated morphologies indicating he presence of submicron RF micelles that mediate
blending. More recently RF-PS polystyrenes end-functionalized with longer perfluoroalkyl (RF=C7F15, C10F21, C13F27) groups were studied using DSC, nano-indentation and other properties These showed pronounced increases in storage and especially loss moduli compared with polystyrene polymers having the same molecular weights hence indicating an important role especially of the C13F27 groups in both increasing both storage and mechanical loss moduli. The RF groups appear to be present as micelles. Interestingly, compared with the matching PS, the glass transition temperatures of the C13F27-PS polymers were found to decrease by as much as 15°C being seen for longer RF groups consistent with rapid dynamics in the C13F27 micelles below 100°C.

Email:hogenesc@usc.edu